TCG mode fails to boot Linux kernel with qemu 2.6.0 and libvirt 2.0.0

[Javier Peña]

Trying to boot a Cirros (minimal Linux) VM with qemu 2.6.0 and libvirt 2.0.0 in TCG mode fails for me. The VM gets stuck in "Starting up ..." and never moves on. The command line used to boot the VM was:

LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin QEMU_AUDIO_DRV=none /usr/libexec/qemu-kvm -name guest=instance-00000002,debug-threads=on -S -object secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-1-instance-00000002/master-key.aes -machine pc-i440fx-rhel7.3.0,accel=tcg,usb=off -cpu SandyBridge,+osxsave,+hypervisor,+xsaveopt -m 512 -realtime mlock=off -smp 1,sockets=1,cores=1,threads=1 -uuid ae38b0e1-b3ae-41ec-8e50-c89669a2ec1c -smbios 'type=1,manufacturer=Red Hat,product=OpenStack Compute,version=14.0.2-7.el7ost,serial=edd3a67d-6ce5-4c36-8f20-085d1097abb7,uuid=ae38b0e1-b3ae-41ec-8e50-c89669a2ec1c,family=Virtual Machine' -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-1-instance-00000002/monitor.sock,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -boot strict=on -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive file=/var/lib/nova/instances/ae38b0e1-b3ae-41ec-8e50-c89669a2ec1c/disk,format=qcow2,if=none,id=drive-virtio-disk0,cache=none -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -netdev tap,fd=28,id=hostnet0 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=fa:16:3e:c1:27:73,bus=pci.0,addr=0x3 -add-fd set=1,fd=31 -chardev file,id=charserial0,path=/dev/fdset/1,append=on -device isa-serial,chardev=charserial0,id=serial0 -chardev pty,id=charserial1 -device isa-serial,chardev=charserial1,id=serial1 -device usb-tablet,id=input0,bus=usb.0,port=1 -vnc 0.0.0.0:0 -k en-us -device cirrus-vga,id=video0,bus=pci.0,addr=0x2 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5 -msg timestamp=on

A qcow2 image can be downloaded from http://download.cirros-cloud.net/0.3.4/cirros-0.3.4-x86_64-disk.img to reproduce the issue. I've seen a similar failure with a CentOS 7.2 image.

I am also attaching the libvirt log from the failed VM.

[Javier Peña (jpena-c)]

The Cirros image has a 3.2.0 kernel, in case it helps.

[Thomas Huth (th-huth)]

Well, there are some clear indications in your log what might be wrong:

warning: TCG doesn't support requested feature: CPUID.01H:EDX.vme [bit 1]
warning: TCG doesn't support requested feature: CPUID.01H:ECX.x2apic [bit 21]
warning: TCG doesn't support requested feature: CPUID.01H:ECX.tsc-deadline [bit 24]
warning: TCG doesn't support requested feature: CPUID.01H:ECX.osxsave [bit 27]
warning: TCG doesn't support requested feature: CPUID.01H:ECX.avx [bit 28]

Try to disable these features in your "-cpu" parameter for example.
If that does not help, please try to start QEMU without libvirt first, to see whether it is an issue with libvirt (then you should report it to their bug tracker instead) or QEMU. And please use the latest release of QEMU (currently v2.8.0), since the bug might have already been fixed in a later version.

[Launchpad Janitor (janitor)]

[Expired for QEMU because there has been no activity for 60 days.]